小红伞更新失败

昨天心血来潮卸载NOD32 ESS改用小红伞Avira Premium Security Suite英文版。高兴的安装完以后开始更新。更新到后来提示error when downloading file。看日志文件会有以下内容:
[UPDLIB] [ERROR] Check sum of the downloaded file does not correspond with your description from the control file.

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